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          <h1 class="post-title" itemprop="name headline">Android-动态加载DEX</h1>
        

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        <p>######1). 新建项目并创建Dynamic接口<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">/**</span><br><span class="line"> * 接口</span><br><span class="line"> * Created by mazaiting on 2018/6/26.</span><br><span class="line"> */</span><br><span class="line"></span><br><span class="line">public interface Dynamic &#123;</span><br><span class="line">  String say();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<a id="more"></a>
<p>######2). 创建接口的实现类DynamicImpl<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line">/**</span><br><span class="line"> * 动态实现类</span><br><span class="line"> * Created by mazaiting on 2018/6/26.</span><br><span class="line"> */</span><br><span class="line"></span><br><span class="line">public class DynamicImpl implements Dynamic &#123;</span><br><span class="line">  @Override</span><br><span class="line">  public String say() &#123;</span><br><span class="line">    return &quot;mazaiting&quot;;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>######3). 编译<br>Build -&gt; Make Project, 生成的文件位于<br><img src="https://upload-images.jianshu.io/upload_images/3110861-5d2c0322e892e3fc.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="图1.png"></p>
<p>######4). Gradle任务创建<br>在app/build.gradle文件中追加<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">// 删除dynamic.jar包任务</span><br><span class="line">task clearJar(type: Delete) &#123;</span><br><span class="line">    delete(&apos;libs/dynamic.jar&apos;)</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">// 打包任务</span><br><span class="line">task makeJar(type: org.gradle.api.tasks.bundling.Jar) &#123;</span><br><span class="line">    // 指定生成jar名称</span><br><span class="line">    baseName &apos;dynamic&apos;</span><br><span class="line">    // 打包文件的位置</span><br><span class="line">    from(&apos;build\\intermediates\\classes\\debug\\com\\mazaiting\\dynamicjar\\&apos;)</span><br><span class="line">    // 打包到jar后的目录结构</span><br><span class="line">    into(&apos;com/mazaiting/dynamicjar/&apos;)</span><br><span class="line">    // 去掉不需要打包的目录和文件</span><br><span class="line">    exclude(&apos;text/&apos;,&apos;Dynamic.class&apos;,&apos;R.class&apos;,&apos;BuildConfig.class&apos;)</span><br><span class="line">    // 去掉R$开头的文件</span><br><span class="line">    exclude &#123; it.name.startsWith(&apos;R$&apos;) &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">makeJar.dependsOn(clearJar, build)</span><br></pre></td></tr></table></figure></p>
<p>######5). 在Terminal控制台运行<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"># 查看所有任务</span><br><span class="line">gradlew tasks --all</span><br><span class="line"># 执行任务</span><br><span class="line">gradlew makeJar</span><br></pre></td></tr></table></figure></p>
<p>######6). 生成jar<br><img src="https://upload-images.jianshu.io/upload_images/3110861-762df26a2e103d2f.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="图2.png"></p>
<p>######7). dex打包<br>将打包好的jar文件拷贝到android的安装目录中的<code>\sdk\build-tools\26.0.1\</code>目录下，使用<code>dx --dex --output=dynamic_temp.jar dynamic.jar</code>进行压缩<br>这条命令首先将dynamic.jar编译成dynamic.dex文件，然后再将dynamic.dex文件压缩成dynamic_temp.jar，当然也可以压缩成.zip格式或者直接编译成.apk文件都可以。</p>
<p>######8). 将生成的dynamic_dex.jar文件导入Android工程的assets文件夹下，并删除Dynamic接口的实现包<br><img src="https://upload-images.jianshu.io/upload_images/3110861-13faf8ee64c6f005.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="图3.png"></p>
<p>######9). 使用<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br></pre></td><td class="code"><pre><span class="line">public class MainActivity extends AppCompatActivity &#123;</span><br><span class="line">  /**缓存文件夹*/</span><br><span class="line">  private File mCacheDir;</span><br><span class="line">  /**目标文件*/</span><br><span class="line">  private String mInternalPath;</span><br><span class="line">  </span><br><span class="line">  @Override</span><br><span class="line">  protected void onCreate(Bundle savedInstanceState) &#123;</span><br><span class="line">    super.onCreate(savedInstanceState);</span><br><span class="line">    copyFile();</span><br><span class="line">    setContentView(R.layout.activity_main);</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  /**</span><br><span class="line">   * 拷贝文件</span><br><span class="line">   */</span><br><span class="line">  private void copyFile() &#123;</span><br><span class="line">    // 获取缓存路径</span><br><span class="line">    mCacheDir = FileUtil.getCacheDir(getApplicationContext());</span><br><span class="line">    // 获取dex文件存储路径</span><br><span class="line">    mInternalPath = mCacheDir.getAbsolutePath() + File.separator + &quot;dynamic.jar&quot;;</span><br><span class="line">    File file = new File(mInternalPath);</span><br><span class="line">    // 判断文件是否存在</span><br><span class="line">    if (!file.exists()) &#123;</span><br><span class="line">      try &#123;</span><br><span class="line">        // 创建新文件</span><br><span class="line">        file.createNewFile();</span><br><span class="line">        // 拷贝文件</span><br><span class="line">        FileUtil.copyFiles(this, &quot;dynamic_dex.jar&quot;, file);</span><br><span class="line">      &#125; catch (IOException e) &#123;</span><br><span class="line">        e.printStackTrace();</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  /**</span><br><span class="line">   * 动态加载按钮，布局文件只有一个按钮</span><br><span class="line">   */</span><br><span class="line">  public void loadDex(View view) &#123;</span><br><span class="line">    loadDex();</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  /**</span><br><span class="line">   * 动态加载</span><br><span class="line">   */</span><br><span class="line">  private void loadDex() &#123;</span><br><span class="line">    // 新建DexClassLoader</span><br><span class="line">    // 第一个参数：dex压缩文件的路径</span><br><span class="line">    // 第二个参数：dex解压缩后的文件路径</span><br><span class="line">    // 第三个参数：C/C++依赖的本地库文件</span><br><span class="line">    // 第四个参数：上一级的类加载器</span><br><span class="line">    DexClassLoader dexClassLoader = new DexClassLoader(</span><br><span class="line">            mInternalPath, mCacheDir.getAbsolutePath(), null, getClassLoader());</span><br><span class="line">    try &#123;</span><br><span class="line">      // 加载的类名为jar文件中的完整类名</span><br><span class="line">      Class clazz = dexClassLoader.loadClass(&quot;com.mazaiting.dynamicjar.impl.DynamicImpl&quot;);</span><br><span class="line">      Dynamic dynamic = (Dynamic) clazz.newInstance();</span><br><span class="line">      if (null != dynamic) &#123;</span><br><span class="line">        Toast.makeText(this, dynamic.say(), Toast.LENGTH_SHORT).show();</span><br><span class="line">      &#125;</span><br><span class="line">    &#125; catch (ClassNotFoundException | IllegalAccessException | InstantiationException e) &#123;</span><br><span class="line">      e.printStackTrace();</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>######10). 运行项目<br><img src="https://upload-images.jianshu.io/upload_images/3110861-dc59e4fa6c75012a.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="图4.png"></p>
<p>######<a href="https://gitee.com/mazaiting/app_protection/tree/master/DynamicJar" target="_blank" rel="noopener">代码下载</a></p>

      
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